Lathe



May 13, 1930. A. BJORKLUND 1,758,023

LATHE Filed March 23, 1927 2 Sheets-Sheet l May 13, 1930- A. BJORKLUND 1,758,023

` LATHE Filed March 23, 1927 2 sheets-sheet 2 Patented May 13, 1930 UNITED STATES .ARVID BJORKLUND, OF MINNEAPOLIS, MINNESOTA LATHE Application filed March 23, 1927. Serial No. 177,583.

My present invention relates to lathes and has for its object to provide an extremely simple and highly efficient lathe designed to be knocked down so that the same .may be packed in a very compact space for shipping or storage.

To the above end, generally stated, the nvention consists of the novel devices and coinbinations of devices hereinafter described and dei'ined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout theV several views.

Referring to the drawings :r i

l5 Fig. 1 is a view of the improved lathe in front elevation with some parts broken away and sectioned;

Fig. 2 is a view in end elevation with some parts broken away; j

Fig. 3 is a view in transverse vertical section taken on the line 3,-370f Fig. 1;

Fig. 4 is a view principally in transverse vertical section taken on the line 4--4 of Fig. l;

Fig. 5 is an enlarged plan view of the tailstock with some parts broken away and sectioned, and also showing portions of the bed of the lathe;

Fig. 6 is a detail view with some parts sectioned on the line 6 6 of Fig. 5; t

Fig. 7 is a fragmentary perspective view of one of the frame end members;

Fig. 8 is a fragmentary detail view with some parts sectioned on the line 8-8 of Fig.

,Figa 9 is a perspective view of the shelf removed from the lathe;

1 Fig. 10 is a view showing va modified tailstock; and

Fig. 11 is a detail view principally in section taken on the line 11-11 of Fig. 10, on an enlarged scale.

The frame of the lathe comprises a pair of independent end members each of which comprises a pair of legs rigidly connected at their upper ends, and further connected by a horizontal, inturned, bedsupporting web 13 having a pair of deep notches 14, which extend longitudinally of the lathe.

A bed 15 is detachably supported on the frame end members 12, projects outward thereof at both ends, and has in its top a central longitudinal groove 16 which extends the full length thereof. The front and reai members of the bed 15 are connected by end 55 and intermediate crosstie members 17 inte grally formed therewith below said bed, and having relatively wide and deep notches directly under the groove 16. Formed with the bottom of the bed 15, at the ends thereof, are horizontal, inturned webs 18 that further rigidly connect the front and rear members of said bed, rest on the webs 13 of the end members 12 and have deep notches 19. These notches 19 extend transversely of the lathe 65 and intersectV the notches 14, as best shown in Fig. 8. Nut-equipped bolts 2O are inserted through the notches 14 and 19, at their points of intersection, and rigidly but detachably secure the bed 15 to the frame end members 70 12. The frame end members 12 are-rigidly but detachably Yconnected by a pair of nutequipped crosstie rods'21. The legs of the frame end members 12 are countersunk at 22 to receive the outer ends of the crosstie rods 2O and their nuts so'that they do not project outward of said legs.

A. headstock 23, a tailstock 24 and tool iest 25 are mounted on the bed 15 and are adjustably and detachably secured thereto by clamping plates 26 and cooperating nuts equipped bolts 27'. Said clamping plates 26 span the groove 16 and bear against the under side of the bed 15,v as best shown in Figs. 2, 3, and 4. The longitudinal edges of the bed 15, at the groove 16, are chamfered and the ends of the bearing plates 26 are ieversely chamferedl and have longitudinal sliding contact therewith. The bolts 27 extend through aligned apertures in the clamping plates 26 and the bases of the headstock 23, tailstock 24, and tool rest 25. The nut members of thebolts 27 for the tailstock 24 and tool rest 25 are provided with lever handles .28 by which they may be operated. The aperture in the base of the tool rest 25 is in the form of a slot 20 which permits compound turning and bodily adjustment of said tool rest on the bed 15.

The headstock spindle 30 is driven from 100 'LTI an electric motor 31 by a variable speed device which includes a belt 32 that runs over a pair ot aligned step cone pulleys and 34, the former of which is on the spindle 30 and the latter ot which is on the shaft of the motor 31. Said motor 31 is bolted to a sheltl 35 located directly under the headst-ock 23, and which shell. has a wide upstanding arm that is detachably secured to the bed by upper and lower nut-equipped bolts 37 and 38, respectively. The upper bolt 37 is passed through a bore in the adjacent cross-atie member 17 and a vertical slot 39 in said arm. The bolt 36 is passed through a bore in a lug 40 on the arm 36 and a vertical slot 41 in a lug 42 on the bed l5. Obviously, the slots 39 and 4l permit the shelt 35 to be vertice. ly adjusted to vary the tension on the belt 232. 'lie headstock 23 is positioned on 'the bed 16 outward of the respective end members 12 and its live center is shown as directly applied to the inner end of the spindle and the pulley 83 is dir ctly applied to the other end thereot outward of said end member with the bearing tor the spin dle 30 between said live center and pulley. By thus mounting the headstock 23 with its pulley 33 outward ot the respective end of the bed 16 and aligned with the pulley 34 on the motor 31, the belt 32 is entirely outward of the bed 16 and headstock 23 where the same may be out of the way and may be easily 'changed on the cone pulleys 33 and 34 to vary the speed oi' the spindle 30. By applicants construction a tace plate, not shown, may be readily applied by any suitable means to the outer end ot the spindle 30, see Fig. 2, for holding work to be turned of such diameter that it cannot he mounted over the bed 16.

It will be noted that the apertures in the shelf 35 for bolts 43, which detachably secure the 'motor 81 to said shelf, are in the form of radially arranged slots 44. A tailstocl spindle is mounted for endwise rotary movement in its bearing 46 on the tails-toch 24 and is provided with a radially projecting cam stud 4T which works in a spiral cani slot 48 in the bearing 46. Said cam stud 47 is provided with a nut-acting member 49 for securing the spindle 45 in its bearing 46. This nut-acting member 49 ailords a hand piece by which the cam stud 4T may be moved in the cam slot 48 to impart compound rotary and endwise 'movement to the spindle 45. Obviously, endwise adjustment or" the spindle t'. 45 moves its center pin toward and from the headstocl: 23.

Retering now to the modification shown in Fig. 10, the tailstock 50 is provided with a spindle 51 mounted in a bearing 52 on said tailstock tor `endwise adjustment. rlhe bearing 52 is longitudinally split and provided with a clamping bolt 53 having hand pieceequipped nut 54 for fri'ctionally contracting said bearing onto the spindle 51 to hold the same where set. For moving the spindle 51 endwise to cause its center pin to ent-er a piece of work, a cam 55 is pivoted to the rear end of the bearing 52 tor action on the rear end of said spindle and provided with a hand piece 56 for operating the same.

From the above description it is evidentthat the various parts ot the lathe may be very easily and quickly separated and the parts assembled so as to assume a very conipact form for thepurpose of shipping or storing. By vertically adjusting the sheliE 35, the tension of the belt may be varied, at will, and by mounting the tailstock 24 on the bed 15 tor longitudinal adjustment, the pulley 33 may be properly aligned with the pulley 34. rlire tailstock may be bodily adj usted toward and trom the headfilwk 23 and the spindle 45 may be emlwise adjusted by means oil the nut-acting member 49 to cause its center pin to enter a piece ot work, or to withdraw the same therefrom. After the spindle 45 is properly set, the same may be secured by simply tightening the nut-acting member 49.

By shitting the belt on the step cone pulleys 33 and 34 the speed ot the spindle 2O may be varied, at will.

lll/hat I claim is:

1. In a lathe, Va l'rame having a bed extending outward ot one end thereof, a headstock mounted on the bed outwardly of the frame, a bracket suspended trom the bed below the headstocl', an electric motor mounted on the bracket, pulleys on the headstock and motor outward of the bed, and `a belt arranged to run over the pulleys.

2. The structure defined in claim 1 in which the bracket is mounted for vertical adjustment in respect to the headstock.

In a lathe, a 'trame having a bed eX- tending outward oi one end thereof, a headstock mounted on the bed outwardly ot the frame and having a live center directly applied to the inner end ot its spindle and a pulley directly applied to the other end thereot outward ot the bed and a bearing for the spindle between the live center and pulley, a bracket suspended beneath the bed below the headstock, an electric motor mounted on the bracket and having a pulley aligned with the pulley on the headstock, and a belt arranged to run over said two pulleys.

In testimony whereoip4 I affix my signature.

ARVID BJORKLUND. 

